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In the discussion of the results presented in Table 1 the author's reported using a paired t-test to compare the

two groups of patients in this study on outcomes measured on a continuous scale. I don't see how they could have used a paired t-test here - why would I say this? 

The groups compared were post-surgery with infection and without infection. These are what was measured. HT, BW, BMI, Total operation time, blood loss, surgical procedure (either full or partial gastrectomy), CRP, Hb, preoperative ADN and Postoperative ADN, ADN ratio.

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